Stereo Wiring Help

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Sep 2, 2011
1,041
Hunter 27 Cherubini Alum Creek State Park
My son gave me WM gift card for Christmas, so I went out and bought a new stereo for the boat. Before getting into installing it on the boat, I wanted to hook it up and see what it souded like.

So I took the as yet unwired DC panel out of the boat and brought it and battery in to the house to hook up the new toy on my dining room table. The power wiring instructions were a little confusing, as the yellow wire goes basically straight to the POS of the battery, and the red wire goes to the accesory side of a switch. The black wire goes to chassis ground.

There is nothing about any wire going to the negative bus. I thought every circuit had to have a return to the negative bus to work. The light fixture I hooked up to test the panel did, as did the label backlights and the breaker on/off leds. I checked the voltage where the yellow and red wires connected to my breaker panel, and there is 0v. I then checked for voltage across the DC positive bus, and the DC negative bus, and there's my 12v. But connecting either of the leads from the stereo to the neg bus doesn't help.

At this point, I'm not sure whether the wiring is not right, or the unit just doesn't work at all. Btw, I did pull the blade fuse and put an ohmeter across it to check for continuity.

What don't I understand? Can someone please simplify for me how to wire up a 12v stereo?

Thanks,
Bill
 
Nov 8, 2010
11,386
Beneteau First 36.7 & 260 Minneapolis MN & Bayfield WI
The BLACK wire is for sure a ground. That should go to (-) buss, which should be connected to your battery minus terminal.

The RED wire is the main +12 supply to the unit. It should be switched by your DC panel. I think I saw that you have a new BSS panel with breakers, so this should be fused between the unit and the panel.

The YELLOW wire is a keep-alive source of +12 that can do one or both of these functions: memory/settings/stations save or fast boot. Some units will be OK with this tied to RED. You will have to figure if you want anything like that run straight tio your battery. AYBC frowns against that. If you must, run it to your battery switch, battery side. Make SURE it is fused.

Fusion radios do just fine with them tied. It just takes longer to boot the first time you turn on your panel. Others might forget their settings.
 
Feb 6, 1998
11,701
Canadian Sailcraft 36T Casco Bay, ME
The black wire goes to chassis ground.

There is nothing about any wire going to the negative bus. I thought every circuit had to have a return to the negative bus to work. erstand? Can someone please simplify for me how to wire up a 12v stereo?

Thanks,
Bill
Bill,

On a boat your "chassis ground" is the neg battery terminal or the neg buss connected to it. The black wire gets connected to the system negative buss.

Red is switched, yellow is power and should ideally be "constant" or you can lose settings. If wiring for "constant" be sure to fuse it within 7" of the battery or the switch or wherever you tie into 12V constant power. Red & yellow are BOTH 12V do not connect red or yellow to the negative buss only black..
 
Sep 2, 2011
1,041
Hunter 27 Cherubini Alum Creek State Park
Thanks guys.

What would be the consequences of connecting the yellow to neg?
 
Nov 8, 2010
11,386
Beneteau First 36.7 & 260 Minneapolis MN & Bayfield WI
I figure a 99% chance your unit was fused with an in-line fuse holder... So if you did not smell smoke, then good chance you are OK.
 
Sep 2, 2011
1,041
Hunter 27 Cherubini Alum Creek State Park
The 10a spade fuse is ok; at least it reads 0 ohms on my meter. Do you think there might be a fuse on the circuit board? I don't wanna open it up to see, voiding the warranty, and thus negating any chance to return it.
 
Nov 8, 2010
11,386
Beneteau First 36.7 & 260 Minneapolis MN & Bayfield WI
Don't do that.

If the fuses look OK, then unless you killed it connecting the red and yellow to +12 and the black to -12 should allow it to come on.

This assumes your home +12V power supply can actually deliver the required amperage to allow it to power on. I had a VHF that would not power on at home using my home-made 12v bench source. FYI.
 
Sep 2, 2011
1,041
Hunter 27 Cherubini Alum Creek State Park
Jackdaw said:
Don't do that.

If the fuses look OK, then unless you killed it connecting the red and yellow to +12 and the black to -12 should allow it to come on.

This assumes your home +12V power supply can actually deliver the required amperage to allow it to power on. I had a VHF that would not power on at home using my home-made 12v bench source. FYI.
I'm using my boat battery and new Blue Seas breaker panel. The battery reads 12.75v. That should be enough juice to power up a radio, shouldn't it?
 
Nov 8, 2010
11,386
Beneteau First 36.7 & 260 Minneapolis MN & Bayfield WI
If the battery is sound then you are fine.

Make sure that you have your 12.75V between the two points you are connecting the red/yellow pair and the black wire. Frankly to minimize the possibly of missing something, I'd go (carefully) straight to the battery,
 
Feb 6, 1998
11,701
Canadian Sailcraft 36T Casco Bay, ME
Frankly to minimize the possibly of missing something, I'd go (carefully) straight to the battery,
Ditto. If you're just testing it to see if she powers up this will be fine..
 
Sep 2, 2011
1,041
Hunter 27 Cherubini Alum Creek State Park
I don't have the connectors to wire right to the battery (the leads from the radio are only 8". I'll have to twist some longer wires onto them temporarily.
Don't start berating me about proper wiring techniques. I know all about adhesive heat shrink butt connectors, just haven't ordered any yet.
 
Feb 6, 1998
11,701
Canadian Sailcraft 36T Casco Bay, ME
I don't have the connectors to wire right to the battery (the leads from the radio are only 8". I'll have to twist some longer wires onto them temporarily.
Don't start berating me about proper wiring techniques. I know all about adhesive heat shrink butt connectors, just haven't ordered any yet.
A $2.00 package of alligator clip test leads from Rat Shack are always good to have on hand...;)
 
Sep 2, 2011
1,041
Hunter 27 Cherubini Alum Creek State Park
Maine Sail said:
A $2.00 package of alligator clip test leads from Rat Shack are always good to have on hand...;)
Actually, now that you mention it, I think there's a pair packed away in a box in the basement. Going to see right now.
 
Sep 2, 2011
1,041
Hunter 27 Cherubini Alum Creek State Park
Maine Sail said:
A $2.00 package of alligator clip test leads from Rat Shack are always good to have on hand...;)
Cool. That did it. Listening to Black Cow right now.

Black wire to neg bus, rd/yel to panel breaker.

Relief!
 
Nov 8, 2010
11,386
Beneteau First 36.7 & 260 Minneapolis MN & Bayfield WI
Awesome. Glad you didn't kill it!! :)
 
Dec 11, 2008
1,338
catalina C27 stillwater
Gents-

If ever you have stereo questions, ask the question in a forum post, and then PM me so I can respond for members benefit. I am the marine and powersports engineer / saleman, (and ABYC/NMMA member) for audio products at one of our domestic audio manufacturers. I won't shove our brand product down anyone's throat, but I will answer questions any time about how to get the most from your A/V systems.


I have installed a few audio systems into my own sailboats over the years and am rebuilding a C27 right now with TV and stereo. You can find the project here: http://forums.catalina.sailboatowners.com/showthread.php?t=123450

Holler any time; happy to help!
 
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